refactor: Curl-Logging erweitert und String-Truncation eingeführt

- Entfernt manuelles Abschneiden von Curl-Strings und ersetzt durch die neue `Truncate`-Extension.
- Standardwert für `uri` im zweiten LogCurl-Overload auf "/" gesetzt.
- Verbessert Lesbarkeit und Wiederverwendbarkeit der Logik für Curl-Strings.

src/Leanetec.EConnect.Infrastructure/LogExtensions.cs

@@ -15,10 +15,10 @@ public static class LogExtensions
         int maxLength = 1000,
         LogLevel logLevel = LogLevel.Information)
     {
-        var curl = string.Concat(client.GenerateCurlInString(
+        var curl = client.GenerateCurlInString(
                 request,
                 config
-                ).AsSpan(0, maxLength), "...[truncated]");
+                ).Truncate(maxLength);
         logger?.Log(logLevel, "{curl}", curl);
     }
 
@@ -26,20 +26,20 @@ public static class LogExtensions
         this ILogger<TCategoryName> logger,
         HttpClient client,
         HttpMethod method,
-        string uri = "",
+        string uri = "/",
         HttpRequestHeaders? headers = null,
         HttpContent? content = null,
         Action<StringConfig>? config = null,
         int maxLength = 1000,
         LogLevel logLevel = LogLevel.Information)
     {
-        var curl = string.Concat(client.GenerateCurlInString(
+        var curl = client.GenerateCurlInString(
             method,
             uri,
             headers,
             content,
             config
-        ).AsSpan(0, maxLength), "...[truncated]");
+        ).Truncate(maxLength);
         logger?.Log(logLevel, "{curl}", curl);
     }
 
@@ -54,13 +54,26 @@ public static class LogExtensions
         int maxLength = 1000,
         LogLevel logLevel = LogLevel.Information)
     {
-        var curl = string.Concat(client.GenerateCurlInString(
+        var curl = client.GenerateCurlInString(
             method,
             uri,
             headers,
             content,
             config
-        ).AsSpan(0, maxLength), "...[truncated]");
+        ).Truncate(maxLength);
         logger?.Log(logLevel, "{curl}", curl);
     }
+
+    /// <summary>
+    /// Truncates the string to the specified max length and appends a suffix if truncated.
+    /// </summary>
+    public static string Truncate(this string? value, int maxLength, string suffix = "...[truncated]")
+    {
+        if (string.IsNullOrEmpty(value) || maxLength <= 0)
+            return string.Empty;
+
+        return value.Length <= maxLength
+            ? value
+            : value[..maxLength] + suffix;
+    }
 }